Warm batten fixings trouble

Hi

I am insulating my utility room using the " warm batten" method. I have fitted the insulation board to the wall with some concrete screws through the batten and board onto the insulated block behind.
I am disappointed by the fixings. They didn't pull in particularly tight and I was going to attach some more horizontal battens to add strength and maybe hang some shelves off but I don't have much faith with these fixings.
I used a 6mm pilot hole, I even tried without a pilot whole to see if any better.
I squirted some adhesive foam down the side as a desperate measure!
What shall I do with the other battens to fix them? I was wondering if I could drill a hole and maybe poke some red wall plugs in for the others to get a decent fix?
I can't take this board off but I have a few more to do which I think I will use adhesive and plugs on. Any tips or advice ?
Thanks

your fixings are too short

you probably need to countersink the timber

what blocks are they? -concrete screws are unlikely to grip in thermalites.

Yeah. They are like thermalite type. Thought it would be ok? I did countersink so got 40mm of screw in block (82mm screws).

So plugs maybe way to go, not much else to try!?

No need for a pilot hole with thermolite being soft.
Try some longer 102mm and angle them slightly down or use some of those long grey sleive hammer in fixings.

we tried using concrete screws to fix a door frame into brick.
Everyone raved about them, but they were pretty rubbish.
We ended up using Fischer hammer fixings , which is what we used to fix 3x 2 battens onto the brick to friction fit PIR boards between. TIP (excuse if this is obvious)- make sure you pre-drill hole the length of the fixing plus a bit to allow for the brick dust in the hole (or vacuum the hole out).